capture this signal negedge of input signal ,such as 'rs232_rx0' if you have following code....
input rs232_rx;
reg rs232_rx3,rs232_rx2,rs232_rx1,rs232_rx0,
assign rs232_rx0 = rs232_rx;
assign neg_rs232_rx = rs232_rx3 & rs232_rx2 & ~rs232_rx1 & ~rs232_rx0;
always @(sys_clk)
begin
rs232_rx3 <= rs232_rx2;
rs232_rx2 <= rs232_rx1;
rs232_rx1 <= rs232_rx0;
end
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